Add support for creating pull requests through the MCP server. The new tool allows clients to create PRs with full metadata including assignees, labels, milestones, and due dates.
Changes:
- Add CreatePullRequestImpl in tools/pullreq/create.go
- Register create_pull_request tool in cmd/lib.go
- Update pullreq package documentation
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>